<template>
	<h2>当前求和为：{{sum}}</h2>
  <button @click="sum++">点我+1</button>
  <hr>
  <h2>当前的信息为：{{msg}}</h2>
  <button @click="msg+='!'">修改信息</button>
  <hr>
  <h2>姓名：{{person.name}}</h2>
  <h2>年龄：{{person.age}}</h2>
  <h2>薪资：{{person.job.j1.salary}}K</h2>
  <button @click="person.name+='~'">修改姓名</button>
  <button @click="person.age++">增长年龄</button>
  <button @click="person.job.j1.salary++">涨薪</button>

</template>

<script>
import {ref,reactive,watch,watchEffect} from 'vue'
export default {
  // eslint-disable-next-line vue/multi-word-component-names
  name: 'Demo',
  setup(){
    // 数据
    let sum = ref(0)
    let msg = ref('你好啊')
    let person = reactive({
      name:'张三',
      age:18,
      job:{
        j1:{
          salary:20
        }
      }
    })

    // 监视
    /*watch(sum,(newValue,oldValue)=>{
      console.log('sum的值变化了',newValue,oldValue)
    },{immediate:true})*/

    watchEffect(()=>{
      const x1 = sum.value
      const x2 = person.job.j1.salary
      console.log('watchEffect所指定的回调执行了')
    })

    // 返回一个对象(常用)
    return {
      sum,
      msg,
      person
    }

  }
}
</script>
